Sure you can. Voltage is the only way to discern SOC.
You just can't measure accurately under load. You have to measure open circuit 
voltage.
www.mdpi.com/1996-1073/9/11/900/pdf



      From: Willie via EV <ev@lists.evdl.org>
 To: Matthew Quitter via EV <ev@lists.evdl.org> 
 Sent: Sunday, August 6, 2017 9:13 PM
 Subject: Re: [EVDL] Curtis 1238-6501 State of Charge
   


On 08/06/2017 07:38 PM, Matthew Quitter via EV wrote:
> Hi Guys,
> 
> My 1238-6501 Curtis controller gives very different SOC % for similar
> voltages.
> 
> For example I've recorded a pack voltage of 82.2 and had the Curtis show
> 22%, 31%, 43%.
> 
> The pack is made up of 25 Thundersky 160Ah batteries.

With LFP cells, you can't accurately infer SOC from voltages in the 
middle of the range.  The voltage/SOC curve is too flat.
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